/**
 * @author alteredq / http://alteredqualia.com/
 */

THREE.FilmPass = function ( noiseIntensity, scanlinesIntensity, scanlinesCount, grayscale ) {

  THREE.Pass.call( this );

  if ( THREE.FilmShader === undefined )
    console.error( "THREE.FilmPass relies on THREE.FilmShader" );

  var shader = THREE.FilmShader;

  this.uniforms = THREE.UniformsUtils.clone( shader.uniforms );

  this.material = new THREE.ShaderMaterial( {

    uniforms: this.uniforms,
    vertexShader: shader.vertexShader,
    fragmentShader: shader.fragmentShader

  } );

  if ( grayscale !== undefined )  this.uniforms.grayscale.value = grayscale;
  if ( noiseIntensity !== undefined ) this.uniforms.nIntensity.value = noiseIntensity;
  if ( scanlinesIntensity !== undefined ) this.uniforms.sIntensity.value = scanlinesIntensity;
  if ( scanlinesCount !== undefined ) this.uniforms.sCount.value = scanlinesCount;

  this.camera = new THREE.OrthographicCamera( - 1, 1, 1, - 1, 0, 1 );
  this.scene  = new THREE.Scene();

  this.quad = new THREE.Mesh( new THREE.PlaneBufferGeometry( 2, 2 ), null );
  this.quad.frustumCulled = false; // Avoid getting clipped
  this.scene.add( this.quad );

};

THREE.FilmPass.prototype = Object.assign( Object.create( THREE.Pass.prototype ), {

  constructor: THREE.FilmPass,

  render: function ( renderer, writeBuffer, readBuffer, delta, maskActive ) {

    this.uniforms[ "tDiffuse" ].value = readBuffer.texture;
    this.uniforms[ "time" ].value += delta;

    this.quad.material = this.material;

    if ( this.renderToScreen ) {

      renderer.render( this.scene, this.camera );

    } else {

      renderer.render( this.scene, this.camera, writeBuffer, this.clear );

    }

  }

} );